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and Magtalisai
Sardonyx is sometimes treated to bring out its reddish tones
which occurs in many colors
Its bright green coloration is due to traces of chromium
Black Spinel 4x6mm Faceted Rondelle - 15-16 Inch 68201 and MagtalisaiSpinel is a hard vitreous magnesium aluminum oxide, and comes in a range of other colors, but those varieties are transparent. Black Spinel not only has the dark color, but it is opaque as well, rendering its black especially deep and mysterious. Sometimes called the "Black Prince's Ruby" for its role in the English crown. It has been mistaken for ruby and sapphire at times, but can be distinguished by its structure and its lower relative hardness.
